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C Brain Teasers: Exercise Your Mind

Forget the sqrt() Function

Test your understanding of C programming by predicting the output of a code puzzle that avoids the sqrt function. Learn to analyze C code closely and improve your problem-solving abilities through practical exercise and discussion.

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Puzzle

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C
#include <stdio.h>
double babylonian(double r)
{
  double low, high;
  int x;
  const int precision = 7;
  low = 1.0;
  high = r;
  for( x=0; x<precision; x++ ) {
    high = (high+low)/2.0;
    low = r/high;
  }
  return(low);
}
  int main()
{
  double pv, sr;
  printf("Enter a positive value: ");
  scanf("%lf", &pv);
  if( pv <= 0 )
    return(1);
  sr = babylonian(pv);
  printf("The result is %f\n", sr);
  return(0);
}
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